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Finding the Fourth Proportional to 168.24, 231.72 and 158.16

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Solution

The fourth proportional to 168.24, 231.72 and 158.16 is: 217.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.24 : 231.72 = 158.16 : x
  2. Step 2: Convert to fraction form
    168.24/231.72 = 158.16/x
  3. Step 3: Cross multiply
    168.24x = 231.72 × 158.16
  4. Step 4: Simplify right side
    168.24x = 36,648.84
  5. Step 5: Solve for x
    x = 36,648.84/168.24
  6. Step 6: Final answer
    x = 217.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.